Related Clues:

• Pigeonhole filler
• System that was called 34-Across before the Internet
• Gift container king put in odd place
• Mail delivery
• Suit of armour
• Pony Express concern
• Bills, catalogs, etc
• Six-day-a-week delivery
• Much of it is junk
• Six-day-per-week delivery
• Room in jail is curtailed after equality package
• Irishman, maybe, turned up for post
• What was the man of letters expecting - to be slung out of Mulligans?
• *Old-school letters
• Contents of AOL folders